Unable to log in to Mailenable and Horde webmail

Refers to:

  • Plesk 11.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 12.5 for Windows

Created:

2016-11-16 12:56:22 UTC

Modified:

2017-01-23 12:43:01 UTC

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Unable to log in to Mailenable and Horde webmail

Symptoms

  1. Login to MailEnable webmail just return login page without any error.

  2. Login to Horde webmail returns 500 Internal Server Error

  3. The following entries can be found in Event Viewer:

    ModSecurity: collection_retrieve_ex: Unable to retrieve collection (name "global", key "global"). Use SecDataDir to define data directory first.

    or

    ModSecurity: Rule 123qwe [id "981242"][file "C:\\/Program Files/ModSecurity IIS/owasp_crs/base_rules/modsecurity_crs_41_sql_injection_attacks.conf"][line "237"] - Execution error - PCRE limits exceeded (-8): (null).

Cause

ModSecurity rules prevent MailEnable/Horde webmail work.

Resolution

Remove Modsecurity modules for MailEnable and Horde webmails:

  • under IIS > MailEnable WEbMail site > Modules for MailEnable
  • under IIS > webmail(horde) site > Modules for Horde
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